(idiomatic, sometimes humorous) A protective helmet, as worn, for example, by a motorcyclist, bicyclist, or soldier in combat. / (dated) The skull.

(idiomatic) A narrative, commentary, etc. which amuses and holds one's attention, but which lacks intellectual depth or importance.

Alternative form of birdbrain

plural of brain farm

(colloquial) cerebrospinal fluid

(informal) overwhelming in a way that prevents coherent thought

(informal, Canada, US) A state in which a new mother is forgetful, absent-minded, or easily distracted.

(neuroanatomy) The part of the brain involved with smelling.

(informal) A state in which a new mother is forgetful, absentminded, or easily distracted.

Wernicke-Korsakoff syndrome